90-65000 - Telescope National Geographic - Free user manual and instructions

USER MANUAL 90-65000 National Geographic

Durchmesser: 3.476 km

Risk of bodily injury!

Never use this device to look directly at the sun or in the direct proximity of the sun. This will result in a risk of blindness.

• Children should only use the device under adult supervision. Keep packaging material, like plastic bags and rubber bands, out of the reach of children, as they pose a choking hazard.
• Never subject the device, especially the optics, to direct sunlight. The concentration of light can cause fires or burns.
• Do not disassemble the device. In the event of a defect, please contact your dealer. The dealer will contact the Service Centre and can send the device in to be repaired, if necessary.
• Do not expose the device to high temperatures.

Privacy protection!

This device is intended only for private use. Please heed the privacy of other people. Do not use it to look into apartments, for example.

Your telescope consists of these parts:

1. Focus wheel
2. Telescope (Telescope tube)
3. Compass
4. Alt-azimuth mount
5. Azimuth scale
6. Scale with 90^ steps
7. Height adjustment wheel
8. LED Viewfinder

Additional equipment:

1. Two Eyepieces (6 mm, 20 mm)
   10.Barlow lens 2X
2. Moon filter
3. Software

Please look for a suitable location to set up your telescope before you begin. Use a stable surface like a table or countertop.

Pointing your telescope

Azimuthal mounting means that you can move your telescope up and down, left and right.

With the height adjustment wheel (7) and the turnable azimuth mount, you can point the telescope at any object you want. Use the wheel (7) to tilt the telescope up and down. By using the azimuth mount like a turntable you can pan the telescope to the left and to the right.

Fine adjustment is done with the aid of the LED Viewfinder (8). Look through the viewfinder and try to align it with the North Star in the centre of the crosshairs (No. 1).

Which eyepiece is right?

It is important that you always choose an eyepiece with the highest focal width for the beginning of your observation. Afterwards, you can gradually move to eyepieces with smaller focal widths. The focal width is indicated in

millimeters, and it is written on each eyepiece. In general, the larger the focal width of an eyepiece, the smaller the magnifi cation.

There is a simple formula for calculating the magnifi cation:

Focal width of the telescope tube / Focal width of the eyepiece

= Magnificatior

The magnifi cation is also depends on the focal width of the telescope tube. The telescope has a focal length of 500mm

From this formula, we see that if you use an eyepiece with a focal width of 20mm , you will get the following magnification:

500mm / 20mm = 25× magnification

The table below shows some common magnifi cations.

Telescope tube focal width	Focal width of eyepiece Mag	nifi cation Magnifi cation with 2X Barlow lens
500 mm 20 mm 25X 50X
500 mm 6 mm 83X 167X

NOTES on cleaning

• Clean the eyepieces and lenses only with a soft, lint-free cloth, like a microfi bre cloth. Do not apply excess pressure to the cloth to avoid scratching the lenses.

• To remove more stubborn dirt, moisten the cleaning cloth with an eyeglass-cleaning solution, and wipe the lenses gently.

• Protect the device from dust and moisture. After use, particularly in high humidity, let the device acclimate for a short period of time, so that the residual moisture can dissipate before storing. Remove the dust cover and store it in the included bag during use.

• To remove dust on the mirrors, use a fine brush or air blower (from your local camera shop or optician). Don't touch any mirror surface with your fingers - they may damage the coating.

DISPOSAL

• Dispos of the packaging materials properly, according to their type, such as paper or cardboard. Contact your local waste- disposal service or environmental authority for information on the proper disposal.

• Please take the current legal regulations into account when disposing of your device. You can get more information on the proper disposal from your local waste-disposal service or environmental authority.

Telescope ABC:

What do the following terms mean?

Barlow Lens:

The Barlow lens was named after its inventor, Peter Barlow, a British mathematician and physicist who lived from 1776-1862. The lens can be used to increase the focal width of a telescope. Depending on the type of lens, it is possible to double or even to triple the focal width. As a result, the magnifi cation can also be increased. Also, see Eyepiece.

Focal width:

Everything that magnifi es an object via an optic (lens) has a certain focal width. The focal width is the length of the path the light travels from the surface of the lens to its focal point. The focal point is also referred to as the focus. In focus, the image is clear. In the case of a telescope, the focal widths of the telescope tube and the eyepieces are combined.

Lens:

The lens bends the light which falls on it in such a way that the light creates a clear image at the focal point, after it has traveled a certain distance (focal width).

Eyepiece:

An eyepiece is a viewing system comprised of one or more lenses. The eyepiece magnifi es the clear image generated at the focal point of a lens.

There is a simple formula for calculating magnifi cation:

Focal width of the telescope tube / Focal width of the eyepiece

= Magnificatior

In a telescope, the magnification depends on both the focal width of the telescope tube and the focal width of the eyepiece.

Magnification:

The magnifi cation corresponds to the difference between observation with the naked eye and observation through a magnifi cation apparatus (e.g. a telescope). Observation with the naked eye is considered single, or 1x magnifi cation. Accordingly, if a telescope has a magnifi cation of 30X , then an object viewed through the telescope will appear 30 times larger than it would with the naked eye. Also see Eyepiece.

Useful accessories can be found at www.bresser.de

Possible objects for observation:

We have compiled and explained a number of very interesting celestial bodies and star clusters for you. On the accompanying images at the end of the instruction manual, you can see how objects will appear in good viewing conditions through your telescope using the eyepieces that came with it.

The Moon

The moon is the Earth's only natural satellite.

Diameter: 3,476 km

Distance: approx. 384,400 km from Earth

The moon has been known to humans since prehistoric times. It is the second brightest object in the sky (after the sun). Because the moon circles the Earth once per month, the angle between the Earth, the moon and the sun is constantly changing; one sees this change in the phases of the moon. The time between two consecutive new moon phases is about 29.5 days (709 hours).

Orion Nebula (M 42)

M 42 in the Orion constellation

Distance: 1,344 light years from Earth

With a distance of about 1,344 light years from the Earth, the Orion Nebula (Messier 42, abbreviation: M 42) is the brightest diffuse nebula in the sky it is visible with the naked eye and a rewarding object for telescopes in all sizes, from the smallest fi eld glass to the largest earthbound observatories and the Hubble Space Telescope.

When talking about Orion, we're actually referring to the main part of a much larger cloud of hydrogen gas and dust, which spreads out over the half of the Orion constellation. The expanse of this enormous cloud stretches several hundred light years.

Ring Nebula in Lyra constellation (M 57)

M 57 in the Lyra constellation

Distance: 2,412 light years from Earth

The famous Ring Nebula (M 57) in the constellation of Lyra is often viewed as the prototype of a planetary nebula; it is one of the magnificent features of the Northern Hemisphere's summer sky. Recent studies have shown that it is probably comprised of a ring (torus) of brightly shining material that surrounds the central star (only visible with larger telescopes), and not of a gas structure in the form of a sphere or an ellipse.

If you were to look at the Ring Nebula from the side, it would look like the Dumbbell Nebula (M27). With this object, we're looking directly at the pole of the nebula.

Dumbbell Nebula in the Vulpecula (Fox) constellation (M 27)

M 27 in the Fox constellation

Distance: 1,360 light years from Earth

The Dumbbell Nebula (M 27) in the Fox constellation was the first planetary nebula ever discovered. On 12 July 1764, Charles Messier discovered this new and fascinating class of objects. We see this object almost directly from its equatorial plane. If you could see the Dumbbell Nebula from one of its poles, it would probably reveal that it's in the shape of a ring, and we would see something very similar to what we know from the Ring Nebula (M 57). In reasonably good weather, we can see this object well even at small magnifi cations.

Warranty and warranty term extension

The warranty term is two years from the date of purchase. Please keep your proof of purchase.

Register at www.bresser.de/warranty and fill out a brief questionnaire to get your warranty term extended to five years. Registration must be completed within three months of purchase (date of receipt) to validate the warranty. If you register thereafter, the warranty term will not be extended. If you have problems with your device, please contact our customer service first. Do not send any products without consulting us first by telephone. Many problems with your device can be solved over the phone. If the problem cannot be resolved by phone, we will take care of transporting your device to be repaired. If the problem occurred after the warranty ended or it is not covered by our warranty terms, you will receive an estimate of repair costs, free of charge.

Service Hotline: [phone]

Important for any returns:

Please make sure to return the device carefully packed in the original packaging in order to prevent damage during transport. Also, please enclose your receipt for the device (or a copy) and a description of the defect. This warranty does not imply any restriction of your statutory rights.

Your dealer: Art. No.:

Description of problem:

Name: Telephone:

Street: Date of purchase:

City/Postcode: Signature:

BESCHERMING van privacy!

Advertencias de character general

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The Moon

Orion Nebula (M 42)

Ring Nebula in Lyra constellation (M 57)

Dumbbell Nebula in the Vulpecula (Fox) constellation (M 27)

KOMPAKT-TELESKOP COMPACT TELESCOPE 114/500

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